Screw-bolt-nut-tightening means



June 19, 1923. 1,459,492

P. A. JOHNSON SCREW BOLT NUT TIGHTENING MEANS Filed May 19. 1921 Patented dune it 1 92?).

PETER a. Johnson, on ronrrieirn, onneon, nssrenon re rnon'as v. srannrrnn,

or ronrnenn, cannon. I

SCREW-BOLT-NUT-TIGHTENING MEANS,

Application filed may 19,

To aZZ whom it may concern:

Be it-known that 1, PETER A. JoHNsoN, a citizen of the United States, and a resident of the city oi" Portland, country of Multno- 5 mah, and State of Oregon, have invented a certain new and useful Improvement in Screw-Bolt-Nut-Tightening Means, of which the following is a specification,

The object of my invention is to provide simple power driven mechanical means for tightening firmly the nuts on screw bolts by which two plates, or other pieces are joined or drawn together, in order to bring the two pieces so united as closely together as. posie sible.

A force must be applied for pressing the two or more pieces firmly against each other at the instant the nut of the bolt is rotated for tightening; and these operations must be to repeated untii the two or more pieces have been drawn together as closely as possible.

Heretofore it has been attempted to promote the tightening of the nut by striking the head of the screw belt at the instant the nut was rotated, and in this way attempt to bring the plates or pieces to be bolted together, closer together at the instant the wrench was operated to rotate the nut. But

' obviously it was dificult to st synchronous in action between the force driving the pieces together and the force rotating the nut; and

in fact the blow on the head of the nut had the tendency to throw the wrench oft.

My invention has for its object the provid- 3E5 ing of a device (preferably power driven) in which said forces are coordinated.

My invention consists of a power driven reciproca ing haer provided with a head. actuatmg a device having a cavity adapted at for rewiving the projecting end of a screw boit, and the nut of the latter; the head bein adapted to engage the sides of the nut, an projecting below that face of the latter which wild bear on one of the said two or L6 more pieces; and the said head having an up and down sliding movement on the nut, so that it may strike a blow on the underlying piece, and thus force such piece a 'ainst theother piece; and in combination wit such rerear. Serial no, eraser.-

ciprocating hammer ll provide means for partly rotatin the latter at the instant of the blow, for tiglimning the nut.

Detimng my invention in a more general 7 way, it may be said to comprise the method of mechanically tightening thelnut of a screw bolt uniting two pieces, consisting in forcing one piece firmly against the others by blows delivered against one piece, and turning up the nut on the belt, at the instant ofsuch blows.

An incidental feature and resuit of my invention is that the strain on the threads of the bolt and nut is relieved, since the pieces are forced together thru the medium at the impact of the hammer at the instant the nut is tightened, and the nut functions onl to hold the pieces in that closeness into which they have been put by the force of thebiow: In this way the threads of both bolt and nut are kept in a better sha e to sustain the stress imposed upon them, l y invention is illustrated in the accompanying drawings, in which:

F 1g. 1 is a perspective elevation of my invention operated for bolting two plates together;

Fig. 2 shows a section of my machine, and also illustrates the manner of its operation;

Fig. 3 is a section on the line 3-45 of Fig. 2;

Fig. 4 in a sectional detail of the divided rin or washer 5;

ig. 5 is a section on the iine 5--5 of Fig. 2; and v V I Fig. 6 is a section on the iine fi-d of Fig. 2..

My machine comprises a housing a in which is 'reciprocateda piston-hammer 5,

thru the medium of compressed air deiivcred thru a pipe 0; the admission of air. into the cylinder ii being controiied by a valve-e operated by a trigger c mounted on the handle 5. In the housing a is mounted a barrel f, constituting an extension of the cylinder 0? of-the piston-chamber Z and said extension f constitutes a bearing in which reciprocates and rotates the upper cylindrical end of the shank g. The latter has a prolit jectin end on which is removably fastened a head it by means of a set screw Z, The entremity 9" er the projecting sha endj 1s squared, or otherwise adapted to prevent the is adapted to receive the nut of the bolt;

The cavity a is adapted to engage the sides of the .ut, and is of a greater depth than the thiecss of the nut, so that the head ispermitted some up and down movement on the nut, as is required in order to permit the head is to strike the blows or taps on the overlying plate 0, which is to be drawn firmly a ainst the underlyin plate p, by screw bo ts and nuts, as 9 an 9'.

, Within the housing a are provided means for rotating the shank g by the same power as drives the piston-hammer b. Such means consist of a sleeve r adapted to fitv on the squared part it of the shank g. The sleeve 1- functions as a, spindle, and in order that it f as may be rotated it is provided with pinions e, a, which engage with the internal-teeth 10 of the housing part '11, and also engage with a pinion t, an integral part of the loose gear a, with which meshes a pinion v carried by the crank-arm w, which is rotated thru the medium of air-operated motors, the

pistons of which are connected with the.

era-shaft o as shown at w and y in Fig; 2. The pinions 6 and 7 shown in Fig. 5 are. carried by the rotatary valves contained in the valves housing 8 and 9 shown in Fig. 1.

The latter devices may be of a construc tion similar to that employed in pneumatic drills.

2 represents the intake port connected by a pipe 3 with a source of air-compressing means; and the passage of the air thru the pipe 3 is controlled by a suitable valve which is operated by the rotation of the sleeve 4 on the pipe 3; the rotation of the sleeve t in one direction opening the valve ports for admitting the air to operate the pistons, and thus rotating the crank-shaft w, and the rotation of the sleeve 4: in the opposite direction closing such ports; thus enabling the operator to control the rotation of the shank g in correspondence with the requirements of the work being done.

The valve operated by the sleeve 4, and

the cuts admitting air to the motor, may lurt ermore be so arranged and adapted that in one position of the sleeve the motor will be reversed,

Since a sug struction is sucient for an mechanic, further drawing and descrip ion are deemed ecessary.

tion of this detail of con- 7 antenna The construction and purpose of parts not above specifically described will be un derstood from the accompanying drawings.

The particular construction and arrangement of the parts not essential to the operation of my invention are unimportant. The device shown by the drawings has been actually built as shown,-and upon thorough test was found imminently practical and efficient,

It is to be noted that the shank h of my device or piece similarly constructed, provided with nut engaging means which are equivalent of the head it, constitutes auoperable tool by itself, and couldbe used by applying thereon a socket wrench, or like.

suitable tool, whereby the shank it could be rotated while being tapped with a hammer by hand; but for practical, expeditious, eficient work my device as above described would have to be used.

I claim: y

1. In a device of the character described the combination of a power driven reciprocating hammer, a device actuated by the hammer, said device havin a head adapted to be slidingly engaged with the nut on a screw-bolt and in one position projecting beyond the bearing face of the nut, thereby to strike a blow on the piece on which said nut bears, and power driven means for rotating said device, the rotating means heing adapted to permit the movement of said device by the impact of said hammer.

2. In a device ofthe character described the combination of a power driven reciprocating hammer, a device actuated by the hammer, said device having a head having a cavity adapted to receive the end of a screw bolt and to slidingly engage the nut on the latter, said cavity being of greater depth than the width of the nut so that in.

one position the head will project beyond the bearing face of the nut, thereby to strike a blow'on the piece on which the nut bears, and power driven means ,for rotating said device, the rotating means being ada ted to permit the movementfofsaid device by the. impact of said hammer.

3. In a deviceof the character described the combination of a power driven reciprocating hammer, a device actuatedby the hammer, said device having a detachable head adapted to be slidingly engaged with the nut on a screw-bolt and in one position projectin beyond the bearing face of the nut,,there y to strike a blow-on the piece on Y which said nut bears, and power driven means for rotating said device, the rotating means being adapted to permit the movement of said device hammer.

t. ln'a device of the character described the combination of, a power driven reciprocating hammer,.said device having a deby the impact of said taeheble head' having e cavity adapted to ieee on which the nut hears, andpower receive the end of a screw-bolt and. to slidgriven' means for rotating said. device, the

ingly engage the nut on the letter, said rotating means. heingadepted to permit the 0 cavity being of greater depth than the movement of said device by the impact of 5 width of the nut so that in one position the said haer. 3

head will project beyond thebeering face t of the nut, thereby to strike a blow on the PETER A. JOHNSON. 

